我有一個應用程序,它完美地在我的Galaxy Nexus上運行,但是當我在模擬器上運行它時(僅在某些設置上,一個是平板電腦與JB,另一個是與Android 2.1的ldpi)它崩潰。奇怪的力量關閉
的logcat的看起來像這樣
03-29 16:26:16.842: D/AndroidRuntime(526): Shutting down VM
03-29 16:26:16.842: W/dalvikvm(526): threadid=3: thread exiting with uncaught exception (group=0x4001b188)
03-29 16:26:16.842: E/AndroidRuntime(526): Uncaught handler: thread main exiting due to uncaught exception
03-29 16:26:16.862: E/AndroidRuntime(526): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.doublep.wakey/com.doublep.wakey.Bulb}: java.lang.NullPointerException
03-29 16:26:16.862: E/AndroidRuntime(526): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496)
03-29 16:26:16.862: E/AndroidRuntime(526): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512)
03-29 16:26:16.862: E/AndroidRuntime(526): at android.app.ActivityThread.access$2200(ActivityThread.java:119)
03-29 16:26:16.862: E/AndroidRuntime(526): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
03-29 16:26:16.862: E/AndroidRuntime(526): at android.os.Handler.dispatchMessage(Handler.java:99)
03-29 16:26:16.862: E/AndroidRuntime(526): at android.os.Looper.loop(Looper.java:123)
03-29 16:26:16.862: E/AndroidRuntime(526): at android.app.ActivityThread.main(ActivityThread.java:4363)
03-29 16:26:16.862: E/AndroidRuntime(526): at java.lang.reflect.Method.invokeNative(Native Method)
03-29 16:26:16.862: E/AndroidRuntime(526): at java.lang.reflect.Method.invoke(Method.java:521)
03-29 16:26:16.862: E/AndroidRuntime(526): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
03-29 16:26:16.862: E/AndroidRuntime(526): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
03-29 16:26:16.862: E/AndroidRuntime(526): at dalvik.system.NativeStart.main(Native Method)
03-29 16:26:16.862: E/AndroidRuntime(526): Caused by: java.lang.NullPointerException
03-29 16:26:16.862: E/AndroidRuntime(526): at com.doublep.wakey.Bulb.onCreate(Bulb.java:465)
03-29 16:26:16.862: E/AndroidRuntime(526): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
03-29 16:26:16.862: E/AndroidRuntime(526): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459)
03-29 16:26:16.862: E/AndroidRuntime(526): ... 11 more
03-29 16:26:16.882: I/dalvikvm(526): threadid=7: reacting to signal 3
03-29 16:26:16.882: E/dalvikvm(526): Unable to open stack trace file '/data/anr/traces.txt': Permission denied
03-29 16:26:18.752: I/Process(526): Sending signal. PID: 526 SIG: 9
我發現,如果我註釋掉一個按鈕,問題消失(這是之前的ImageButton,但我把它轉換成按鈕,ImageButton的是工作精)
//This is a global variable declariation
Button premiumFeaturesBtn;
//this is inside the oncreate
premiumFeaturesBtn = (Button) findViewById(R.id.btn_premium_features);
//this is inside a thread
premiumFeaturesBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent premiumPurchase = new Intent(Bulb.this, PremiumPurchase.class);
startActivity(premiumPurchase);
}
});
//This is at the end of my onCreate
Typeface bebas = Typeface.createFromAsset(getAssets(), "fonts/bebas_neue.otf");
premiumFeaturesBtn.setTypeface(bebas);
註釋掉上述行後一切工作正常 這是按鈕
<Button
android:id="@+id/btn_premium_features"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginTop="15dp"
android:background="@drawable/img_btn_premium"
android:padding="10dp"
android:text="@string/premium_features"
android:textSize="25sp" />
01的XML
你能發現我做錯了嗎? 我認爲這個問題是在這條線
premiumFeaturesBtn = (Button) findViewById(R.id.btn_premium_features);
因爲之前我有時得到的錯誤說我不能投上的ImageButton 按鈕,但顯然我不是
當你在按鈕定義中擺脫了android:background屬性時會發生什麼? – MarsAtomic 2013-05-11 13:12:48
在嘗試通過findViewById()方法初始化小部件之前,請確保調用了'setContentView(R.layout.layoutName)'方法。 – Sajmon 2013-05-11 13:14:16
刪除背景後,它仍然崩潰。 我在onCreate的beginnig中調用setContentView,所有事情都在它後面完成 – DoubleP90 2013-05-11 13:16:25